Numerical Simulation Of The Sandy Ablation Of Centrifugal Pump Impeller Flowed Passage Parts In High Sandy Flow

Centrifugal pumps are hydraulic machines which are widely used in pipeline transportation. The main invalid form is the abrasion of impeller. The solid-liquid two-phase flow within the pump is the quite attentive question by the pump designer, because the interior flow directly affects the performance of pump. The interior flow of pump is the quite complicated turbulent flow. It is affected not only by the circumrotation and the surface curvature of impeller, but also by the sandy materials, even has the backflow and disengaged flow. They are one of the rather complicated numerical calculations in the fluid engineering field.The subject has applied hydrokinetics to compare and analyze several kinds of theories and methods of turbulent flow. Based on the understanding the abrasion mechanism of centrifugal pump flow passage parts in high sandy flow, it has used normal κ - ε theory, and the mixture model has been selected. The subject has established the geometry model of the centrifugal pump, then the body-fitted coordinate systems and the tetrahedron grid systems are applied to establish grids system for calculate, finally fluent software is used to calculate the numerical simulation model about three-dimension solid-liquid two-phase turbulent flow.The subject selects YLB50-20 centrifugal pump. It has taken solid-liquid two-phase flow as the medium and applied multiphase model to calculate. The algorithm of SIMPLEC has used to correct of the pressure. After setting different boundary conditions, the physical models are computed in three-dimension solid-liquid two-phase turbulent flow of centrifugal pump in rinsing fluid field and muddy fluid field by choosing the different solid particle diameter and sandy volume fraction. Base on the calculative results in different typical work conditions, we can analyze the pump's hydraulic performance and interior distribution rules and the interaction of some fluid parameters, such as consistence, velocity and pressure etc. We also can understand the fluid rules of particle and the abrasion mechanism through analyze the abrasion of the centrifugal pump. Using thenumerical simulation results we can summarize the affection of the geometric parameters and the medium to the pump's performance. Thus, it is very significant to supply corrective measures to pump's design and to find the factors affecting the pump's performance and to supply reference for further study the solid-liquid two-phase turbulent flow of this kind of pump.The subject has studied the numerical simulation of the three-dimensional interior solid-liquid two-phase flow in the centrifugal pump and summarized some rules and the trajectory of solid particles. The work of this paper will be significantly helpful to afford new methods and experiences to design and to provide defensive measures to resolve and defend the abrasion of pump's flow passage parts in high sandy flow. All of them are very significant to supply reference for further study centrifugal pump's inner flow in theory and practice.